1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe720cf264e4e0778266d99d95fd25d48ab5668e65a8d4e479792a0fae1b7fae8. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1c3cb1fc-b890-4bf5-bf8a-bd7b6e4d6438.json and https://artists.proofprofile.net/proofs/artist/1c3cb1fc-b890-4bf5-bf8a-bd7b6e4d6438.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db051393ac1b04d6c6e7c84c97f7ab84cbe26ef388db617f0f0ad3c27ce3836. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAGE2276266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13fe268a495cd1079462a0ed8ca87d09e78528646f791ba655ceb4c38771b0f0. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAGH2254020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd35080f53af40b0a70d42c1e896f695e8c8b95cff255c3a9804db6c0b1d7fc67. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAGN2242891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c4f3268728fd416dca98e89d1cdf18bbff2c47a1d1676ae70b8ad2da75623f6. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNMX2222260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3ff9b5d5cb30c059c9db839cf601fc54d3c73ad2a086eacaebeebd5d21492b9. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNMX2222259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c9d6416e73d98f303aaed4b5f7bd4fd69982186e515616a27519ea8c840dc0. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNMX2222258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeadc0e042e739b384d27c1f3e88711be24ba18ac06b8892870b7cf211ae9419. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNMX2222257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdfb4321aa8106ae2b33f3ffbb99f81695fe1ae5daea3ed8f6741cd3cd721caf. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA82383568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd39ef67f5bc17b88db332e1725ae84e12fadc34e9ba40bc423ece0920ca62944. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAHB2368611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeefd2b4fbd586adc2e93b623db7969b79ec6274657760e1977cb4cf7ea559c2. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB42312066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x732de5f8950719c65f3d8f87c2c71caab7e87cb4193c37f0a8be06bb1eca9ca2. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB42312070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86e456499be5628dfa4c531b6d43c891770bfc53d4a00ad0666b6d4b14e74b93. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB42312071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31820e0f4359e410f25a9f742c0ea5f0b5f91b116605994199971c8b64dd379b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB42312072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad281383accf35ee55da6c333d95c5bae991857dc3cab7ddd020fd6eeaed2e9c. Chain 2 (Bitcoin): anchored in block 957564 (2026-07-11T12:19:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB42312073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9daae77077df1b335948d70727b624630d7b7ab77cebf5a8db2f20b6342f9ad. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB42312078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4794d1f5c56291ad8c9925eb7f4c29eb6092616541f1d505e341467cfc29c5a. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB42312079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x868604e057d90a82f479ec8128b1aa4171a6398a6849920f147fa8038fac16a5. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMER2449202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdf21baee41dba1ff52ec62457e7ad063736478cdb51030aeee96840b268ae9d. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZAC012401238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdab030195b5f6b9385aca85e9898e393eab61f88792f8e7b96a55ae52b13942a. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZAC012401270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaafaac7045b1396b846c9346b9da21c9b139b3046b1537d033ca903e15d85257. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZAC012401267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9813a63d1a88c2d23485e39b0f4073933f00eea6adf31487db13e693672e4b8. Chain 2 (Bitcoin): anchored in block 957526 (2026-07-11T06:03:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZAC012401342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c9d179b6fe4e2ccb769943031ebd923cf747bea78e8141e82bd12f235d535c. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUMU32501021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf03439007db3e816612747de84b7bd59f443b4a5ac25fb72c2675814388a55c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZAC012401264.